Staple having deflecting points



June 9, 1953 H. s. HELLER 2,641,154

S TAPLE HAVING DEFLECTING POINTS Filed Aug. 51, 1950 v INVENTOR.

Y HAROLD S. HELLER mam; wow

ATTORNEYS Patented June 9, 3.953

UNITED STAT PATENT OFF IxC'Ei This invention relates to staples and more par-- ticularly, to staples of the type which are ad'-- hesively or otherwise suitably connected in strip form for use in stapling machines, the staples of the strip, in use thereof, being successively removed from the front end of the strip and being driven into the work by the blade or plunger of the stapling machine.

The invention has for its primary object the provision. of a staple which markedly increases holding power, the resistance of the staple to removal or withdrawal from such materials as plaster, Celotex, marine sheathing, wall boards, corrugated test boards, etc. being substantially fifty per: cent. greater than that of staples. heretofore used, with such materials.

A morespecific object of the present invention is the provision of a staple in. which the increased, holding power thereof is due to or the result of an inwardly and downwardly extending V-shaped notch which is cut or otherwise suitably formed in the outer surface of each,

staple. leg adjacent but spaced. from the lower work-penetrating end thereof. As will; herein after appear, these notches in the outer surfaces of the staple legs not only bring about an interlocking of the staple legs and the material into which they are driven, the material entering the notches to thereby form the interlock, but also causing the lower end portions of the staple legs below the notches, to toe outwardly or diverge as the staple lengths are driven into the material, a toeing or divergence which is of material importance in the resistance of the staple to removal or withdrawal.

A further object of the present invention is the provision of a staple which is characterized not only by its markedly increased holding power but also, by its structural simplicity and its manufacturing economy.

Further objects of the present invention, and certain of its practical advantages, will be referred to in or will be evident from the followin description of one embodiment of the invention, as illustrated in the accompanying drawing, in which Fig. 1 is a front elevational view of the staple here chosen for the disclosure of one embodiment of the invention, the view being on a much enlarged scale;

Fig. 2 is a side elevational view of the staple, on the same enlarged scale;

Fig. 3 is a view illustrating the use of the present staple for the securement of a covering member to a plaster wall, the view being on the same enlarged scale; and

1 Claim. (01. 85'-49 Fig. 4 is. a perspective- View of a section of a strip of the present staples in adhesively connected relationship, the view being on a reduced scale from that" used in Figs. 1 to 3 inclusive";

Before the staple here illustrated for the disclosure of one embodiment of the invention is specifically described, it is to be understoodthat the present invention is not limited to the structural details here shown, a staples embodying" the present invention may take other forms. It also is-tobe understood that the terminology or phraseology herein used is for purposes off description and not or limitation, as the scope of the present invention is denoted by the appendant claim.

The staple here illustrated, for the disclosure of one embodiment of'the present invention, is of the type which i's'used in a stapling machine, such as a portable hand-held" and hand-operated machine; and in which a plurality of the staples are adhesively or otherwise suitably connected in'strip form, as in Fig; 4,, for convenience in handling and in loading a stapling machine, the staples of the strip; in use thereof, being successivelysheared from the front end thereof andbeing driven into the work by the reciprocatingblacle or plunger of the stapling machine.

As is usual, the present staple, which is formed from flattened spring wire or sheet metal, comprises a pair of laterally spaced legs 10 and. H, and a crown or top portion [2 connecting the upper ends of said legs, the crown or top portion being integral with the legs and being here shown as of upwardly curved or arcuate form, although it may be of straight or fiat form, if desired.

For effective penetration of the material into which the staple is driven in use thereof, the lower ends I4 of the staple legs are of triangular form in side elevation, with the tapered or inclined front and rear edges l5 and [6 of the pointed lower end M of each staple leg having an angular relationship of approximately 45. It is to be understood, however, that the lower ends I4 of the staple legs may be otherwise shaped for work-penetration, if desired.

In the outer surface of each leg of the present staple is cut or otherwise suitably formed an inwardly and downwardly extending notch' I8 of substantially V-shape in vertical section, the notch in one leg being opposite the notch in the other leg and the two notches being adjacent but spaced from the pointed work-penetrating lower ends Id of the staple legs. For a staple which has a length or height of from .425 to .450 of an inch, the notches I8 may be from .319 to .350 of an inch from the top of the staple crown, and for a staple in which the legs thereof have a thickness of .026 of an inch, the notches may have a depth of from .003 to .010 of an inch. It is to be understood that such relationships are illustrative only and that other relationships are embraced by the appended claim.

Although not limited thereto, use of the present staple is particularly advantageous with materials which are crumbled, granulated or cracked when penetrated by standard form staples, such.

as plaster, Celotex, marine sheathing, wall boards, corrugated test boards and like materials. Experience has shown that with such materials, the present staple has a markedly and surprisingly increased holding power, as much as fifty per cent more than that of standard form staples. This is due, of course, to the provision of the leg notches I8, which bring about an interlocking of the staple legs and the material, such as the plaster wall 20, Fig. 3, into which the staple legs are driven for the securement to such wall of the yieldable covering member 2|, the plaster material entering and substantially filling said notches for the formation of such interlock. In addition, the leg notches 18 bring about an outward toeing or lateral divergence of the lower end portions of the staple legs, the portions between the notches and the tips of the work-penetrating ends [4, as the staple legs are driven into the work, such as the plaster 20, as shown in Fig. 3.

Thus, the present staple, although simple and inexpensive in form, has a holding power far and beyond that of prior staples, especially when used in materials of the aforesaid character.

For manufacturing economy, the notches [8 may be formed after the staples which are to receive them are in strip form, as in Fig. 4, as will be readily understood.

To those skilled in the art to which the present invention relates, other features and advantages of staples embodying the invention will be evident from the foregoing description of one such embodiment.

What I claim is:

A staple of rectangular cross section substantially throughout its length adapted to be connected with like staples in strip form for use in a stapling machine, the staple comprising a pair of laterally spaced legs, and a crown connecting the upper ends of said legs, each of said legs being provided with a single generally V-shaped notch adjacent but spaced from the lower work-penetrating end of the leg, the notches of the two legs extending inwardly and downwardly from the outer side surfaces thereof and receiving the material into which the staple legs are driven in use of the staple, with the consequent provision or an interlock between such material and the staple legs and also, bringing about lateral divergent movement of those portions of the staple legs below said notches, the front and rear surfaces of the Work-penetrating ends of the staple legs being of beveled or tapered form but the side surfaces of said work-penetrating ends being of generally straight and generally parallel form, the legs of the staple, with the exception of their work-penetrating ends, being of the same thickness and of the same width as the crown of the staple.

HAROLD S. HELLER.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 274,481 Frost Mar. 28, 1883 1,581,887 Taplin Apr. 20, 1926 1,811,060 Obstfeld June 23, 1931 2,034,080 Bitzenburger Mar. 17, 1936 2,111,404 Pankonin Mar. 15, 1938 2,369,961 Gisondi Feb. 20, 1945 FOREIGN PATENTS Number Country Date 20,126 Great Britain Sept. 9, 1907 of 1907 

